error[E0521]: borrowed data escapes outside of closure
  --> $DIR/scope_callback_inner.rs:7:17
   |
5  |       lua.scope(|scope| {
   |                  -----
   |                  |
   |                  `scope` declared here, outside of the closure body
   |                  `scope` is a reference that is only valid in the closure body
6  |           let mut inner: Option<Table> = None;
7  |           let f = scope
   |  _________________^
8  | |             .create_function_mut(|_, t: Table| {
9  | |                 inner = Some(t);
10 | |                 Ok(())
11 | |             })?;
   | |______________^ `scope` escapes the closure body here

error[E0373]: closure may outlive the current function, but it borrows `inner`, which is owned by the current function
  --> $DIR/scope_callback_inner.rs:8:34
   |
5  |     lua.scope(|scope| {
   |                ----- has type `&Scope<'_, '2>`
...
8  |             .create_function_mut(|_, t: Table| {
   |                                  ^^^^^^^^^^^^^ may outlive borrowed value `inner`
9  |                 inner = Some(t);
   |                 ----- `inner` is borrowed here
   |
note: function requires argument type to outlive `'2`
  --> $DIR/scope_callback_inner.rs:7:17
   |
7  |           let f = scope
   |  _________________^
8  | |             .create_function_mut(|_, t: Table| {
9  | |                 inner = Some(t);
10 | |                 Ok(())
11 | |             })?;
   | |______________^
help: to force the closure to take ownership of `inner` (and any other referenced variables), use the `move` keyword
   |
8  |             .create_function_mut(move |_, t: Table| {
   |                                  ^^^^^^^^^^^^^^^^^^